Your buying a very nice PSU. I bite my lip as I say this, but maybe too nice for your needs. It depends on how much a budget you are on. If you could bump up your cpu just a little to about 3.0 GHz, you would be fine. I think you would be better served budgeting a little more in a better GPU and a little lees in a PSU.

What is your budget?..... And what do you use your computer for mostly? Lastly, what resolution is your monitor?

Hmmm... I guess $300. I play cs:s alot but I have a lot of other games that i can't play. (L4D2, GTA IV, NFS: HP, MoH) Some school work and I'm between casual and semi-hardcore gamer... maybe 1-3 hours a day? 1600x900 20"

Spend some money on a good heatsink and overclock it a bit. Its not that hard to learn how . You can go with water cooling... If you want to OC alot.. However, I'm not sure if xigmateks dark knight covers and. If it does, get that and do a small OC.